8 The Periodic Table
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periodic table
arrangement of elements in periods and groups and in order of increasing proton number
change of mettallic to non metallic
left is metallic, right is non metallic
group number
number of electrons in the outer shell
period number
number of shells
group 1 general properties
soft metals with general trends down the group 1) decreasing melting point 2) increasing density 3) increasing reactiviity
halogens general properties down the group
non-metals with general grends down the group: 1) increasing density 2) decreasing reactivity
appearence of chlorine
a pale yellow-green gas
appearence of bromine
a red-brown liquid
appearance of iodine
a grey-black solid
displacement reaction
when a more reactive halogen displaces a less reactive halogen from a solution of its salt.
Transition metals properties
a) high densities, b) high melting points, c) form coloured compounds, d) often act as catalysts as elements and in compounds, e) have ions with variable oxidation numbers
noble gases properties
unreactive, monatomic gases due to already having a full outer electron